Engineering calculators, grounded in the standard.
Size traces, decode IP ratings, check creepage, convert wire gauges - every tool tied to the exact clause it comes from, with the working shown. Free, fast, no sign-up.
Three toolkits, one standard of rigor
Each area groups its calculators with the guides that explain the standard behind them.
PCB Design
Trace width, via current, resistance and impedance - sized to IPC-2221 and IPC-2152.
Enclosure & Safety
IP/NEMA ratings, creepage & clearance, UL 94, CTI and hazardous-area - IEC, UL & NEMA.
Converters & References
AWG↔mm, wire ampacity, mAh↔Wh, gauss↔tesla - with the reference tables behind them.
Start with a popular calculator
PCB Trace Width
IPC-2221Width for current & temperature rise.
IP / NEMA Decoder
IEC 60529Decode IP codes & map to NEMA types.
Creepage & Clearance
IEC 60664Minimum spacing for a voltage.
AWG ↔ mm²
ASTM B258Wire gauge to area and diameter.
UL 94 Ratings
UL 94Compare V-0, V-1, V-2, HB & 5V.
mAh ↔ Wh
BatteryCapacity to energy at a voltage.
Recently reviewed and updated
Every page is verified against the primary standard before it ships. Here is what changed most recently.
Built like an instrument, not a guess
Every result cites its clause
Each tool names and links the governing standard and section, so you can trace a number back to its source.
Both methods where they differ
Where standards disagree - like IPC-2221 vs the newer IPC-2152 for trace current - you get both, and a guide on which to use.
Method, assumptions & limits
Every calculator shows the formula, inputs, assumptions and validity limits needed to review the result instead of treating it as a black box.